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Vadimzn: I suspect--because I've done it myself--you copied a header that you intended to use in multiple places, like a chapter heading or whatever, but the chapter header you copied had already been given its header ID. When you copied it, you didn't DELETE the "heading id_12" text inside the <H1> (or header whatever) tags. Go back; delete all the "heading_id_12" bits inside the header tags, then open your TOC editor again, click "okay," and then all your header id's should be automagically renumbered. Save that ePUB, and try running that through ePUBcheck (or better yet, Flight Crew), and I think it should work fine.
heading_id numbers are not intended to be used more than once; they're identifiers by which the ncx, etc., find each header.
Good luck, HTH.
Hitch
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